Matched Pair General Electric GE Nickel Plate 6AU6 Vacuum Tubes Valves RCA 2728 I have played it in

I have played it in my Cern Audio phono pre-preamplifier as a 6SL7 substitute (with an adapter

These US-made 12SF7 tubes were tested on our Paul Hart-calibrated TV7 for shorts

RCA-BRANDED 6GB5 tube tested to spec on our Paul Hart-calibrated TV7/U

This book is in very good condition

Matched Pair General Electric GE Nickel Plate 6AU6 Vacuum Tubes Valves RCA 2728 I have played it inThis matched pair of GE nickel plate 6AU6 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 57 for Tube One and 58 for Tube Two where minimum (65%) is 58 and 100% is 89. These tubes have top, harp getters; nickel plates and excellent flashing. I am playing them in my Musical Paradise MC 3 single ended integrated amplifier (with adapters, not included) with